Module features:
Per 1 channel sensor continuously emits an infrared infrared emission tube, but the strength is not large enough, the infrared receiving tube has been in a shutdown state, the module TTL output is high when the infrared rays emitted without being reflected back or reflected back levels corresponding directions diode has been in the OFF state; when the object to be detected in the detection range, the infrared ray is reflected back and the strength is large enough, the infrared receiving tube conduction module TTL output is low, indicating The diode is lit.